An early identification method of debris flow in strong earthquake area and its application

Abstract

The invention discloses an early-period identification method of debris flow at a meizoseismal area, and belongs to the technical field of debris flow prevention and treatment engineering. The early-period identification method is characterized by comprising the following steps of (a) determining basic parameters such as debris flow full-area area A0, debris flow region formation area A, a shape coefficient F of a debris flow formation region, channel length L of the debris flow formation region and gulley bed gradient ratio J of the debris flow formation region of a potential debris flow region; (b) determining average channel width W of the debris flow formation region, particle size D of the debris flow formation region and loosen solid object source quantity V0 of the debris flow region; (c) calculating an object coefficient V of the debris flow formation region; (d) calculating a debris flow identification index S; and (e) judging whether the debris flow region exists or not. By researching the influence of the debris flow loosen solid object source quantity on debris flow formation, the quantitative object source quantity judgment index of the debris flow is proposed, and theearly-period identification accuracy of the debris flow is greatly improved.

Description

technical field [0001] The invention relates to the technical field of mud-rock flow prevention engineering, in particular to an early identification method and application of mud-rock flow in a strong earthquake area. Background technique [0002] Debris flow is a natural disaster that occurs in mountainous areas. After the mudslides occurred, the mudslides carried a large amount of sand, washed away cities and towns, destroyed farmland and forests, washed away bridges and roads, and blocked traffic. After the strong earthquake, a large number of landslides and collapses were induced in the strongly affected area of ​​the earthquake, which provided a large number of solid sources for the occurrence of later debris flows. Studies at home and abroad have shown that in areas affected by strong earthquakes, many debris flows often occur during the rainfall process after the earthquake, and sometimes they are group debris flows; the watersheds that were not originally debris fl...

AI Technical Summary

Problems solved by technology

The debris flow early warning method based on rainfall monitoring disclosed in this patent document establishes a corresponding model through historical rainfall data and calculates the corresponding critical threshold. It only judges whether a debris flow event can be caused by a single rainfall feature, and the early recognition accuracy of debris flow lower